"There were playdates which were amazingly fun!" Schreiber, 42, told UsMagazine.com at Lexus' Darker Side of Green Debate at NYC's Bowery Hotel Tuesday. "We were playing shoot ups inside the studio, and [our kids] were having squirt gun fights out in the lot," he explained.

And Shiloh and the gang played nice, too. "Everyone got along!" Schreiber said, adding that his famous costar was "very keeping it cool around her kids, or at least protecting them" from too many prying eyes.

As for acting with Jolie? "It was great! I didn't know what to expect," he told Us. "I was very impressed with how normal she was, and how easy she was to work with."